My System

My System, originally published in German as Mein System, is Aron Nimzowitsch's best-known book. It first appeared in installments during the 1920s, and the first English translation was published in 1929. Its purpose is not to teach a catalog of openings, but to provide a framework for middlegame strategy, the central phase that usually follows the opening moves and precedes the endgame, the later phase in which fewer pieces usually remain.

Core concepts for reading the book

• Passed pawn: a pawn with no enemy pawns ahead of it on the same file or either neighboring file. Nimzowitsch examines how to restrain and blockade it.
• Blockade: placing a piece directly in front of an enemy pawn to stop its advance, an idea that becomes especially important against a passed pawn.
• Pawn chain: a diagonal group of connected pawns that protect one another. The book examines how to attack the base of that chain and limit its advance.
• Open file: a vertical line of the board with no pawns on it, which can become an entry route for rooks.

The book is historically important and influential, but not every statement should be treated as an absolute modern law. Some formulations reflect the language and theory of its era. Its lasting value is in teaching readers to notice restraint, important squares, pawn structures, and plans that arise from the position. It is a different kind of work from an opening reference such as the Encyclopaedia of Chess Openings or a periodical collection such as Chess Informant.